The calculations, Defendant said, were unreasonably speculative and uncertain, and damages must be…

The decedent, father of the infant Plaintiff, was killed in a train accident. Testimony showed he was a good and reliable man. Through a representative, the decedent’s surviving child, age five, recovered judgment against the railroad (Defendant). Defendant objected to expert testimony that inflation would probably continue at a minimum annual rate of 5 percent for the next thirteen years (until the boy attained his majority), which was used to calculate the loss in support money caused by the father’s death. The calculations, Defendant said, were unreasonably speculative and uncertain, and damages must be proven with reasonable certainty. Is the testimony valid?